Fix some nits

Author: saethlin

compiler/rustc_middle/src/mir/mono.rs

@@ -534,7 +534,7 @@ impl<'tcx> CodegenUnitNameBuilder<'tcx> {
     }
 }
 
-/// See module-level docs on some contect for "mentioned" items.
+/// See module-level docs of [`rustc_monomorphize::collector`] on some contect for "mentioned" items.
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable)]
 pub enum CollectionMode {
     /// Collect items that are used, i.e., actually needed for codegen.

compiler/rustc_monomorphize/src/collector.rs

@@ -330,7 +330,7 @@ impl<'tcx> MonoItems<'tcx> {
 
     fn extend(&mut self, iter: impl IntoIterator<Item = Spanned<MonoItem<'tcx>>>) {
         for item in iter {
-            self.push(item.clone());
+            self.push(item);
         }
     }